CN109311244B - Tire repair method - Google Patents

Abstract

The invention provides a tire repair method. A tire repair method is provided which comprises arranging repair materials (22, 25) composed of unvulcanized rubber at least at a repair part of a damaged part of a tire (1), arranging heating pads (31, 32) on the surfaces of the repair materials (22, 25), filling filler members (40, 40s) of different sizes into the inner side of the tire (1) at a tire circumferential part (1a) of a part of the tire circumferential direction where the repair materials (22, 25) are arranged, fastening and pressurizing the tire circumferential part (1a) from the periphery by a belt (45), and heating the repair part by the heating pads (31, 32) to vulcanize the unvulcanized rubber of the repair materials (22, 25) to repair the tire. The repair method is applicable to various tires, can maintain the shape of the tire during pressure vulcanization, and is low in cost.

Description

Tire repair method

Technical Field

The present invention relates to a tire repair method for repairing a damaged portion of a damaged tire.

Background

A tire may be damaged by an obstacle during running, and when the damage is more than necessary, repair is required.

In the case of tread damage, a so-called retread method is known in which a vulcanized tread portion with a pattern is attached to an outer circumferential surface of a flat-table tire obtained by scraping the outer circumferential surface of a tread and vulcanizing the tire.

In particular, in the case of an ultra-large tire for a construction vehicle, the manufacture of a regenerated tire is more labor intensive than a tire for a passenger car, a tire for a truck or a bus, and in addition, a portion other than a tread may be damaged in addition to the tread due to traveling on a bad road such as a mine.

Therefore, in particular, in The case of ORR tires for large-sized construction vehicles (Off-The-Road Radial Tire), etc., a method of repairing only a damaged portion of a Tire is strongly desired, and accordingly, The following methods have been proposed: a repair patch made of unvulcanized rubber is arranged at a damaged portion of a tire, a heating liner is attached to the repair patch, and the tire is repaired by heating and vulcanizing the heating liner under pressure (see patent document 1).

On the other hand, the following repairing method is also proposed: after filling the damaged portion with unvulcanized rubber, the portion is sandwiched between a pressure pad and a backup plate of a pressure pad device and heated under pressure to vulcanize the unvulcanized rubber (see patent document 2).

Documents of the prior art

Patent document

Patent document 1: japanese patent application laid-open No. Sho 50-82183

Patent document 2: U.S. Pat. No. 4,303,380

The method for repairing a tire disclosed in patent document 1 is a method for repairing a damaged portion of a tire by disposing a repair patch made of unvulcanized rubber in an unstable state before being set up at the damaged portion of the tire, disposing heating pads on inner and outer surfaces of the tire so as to cover the repair patch, pressing the inner heating pad against the inner surface of the tire by an air bag expanding on the inner side of the tire, pressing the outer heating pad against the outer surface of the tire by an air bag expanding on the outer periphery of the tire, and vulcanizing the repair patch by heating the heating pad in a state of being pressurized from both the inner and outer sides of the tire.

In the tire repair method described in patent document 1, it is necessary to support the tire from the inside against the pressure from the outside of the tire while pressing the heating pad against the air bladder disposed on the inside of the heating pad on the inner surface of the tire, thereby maintaining the shape of the tire.

Therefore, it is necessary to prepare a plurality of types of air bags suitable for the inner surface shape of the tire capable of maintaining the tire shape at the time of press vulcanization according to the tire type, which increases the cost and requires much labor and time for managing the air bags.

In the tire repair method described in patent document 1, in the repair step of the damaged portion, the heating pad heats the repair patch, vulcanizes the unvulcanized rubber of the repair patch, and bonds to the vulcanized rubber around the repair patch. Therefore, the heating pad is disposed not only on the surface of the repair patch but also on the surface of the tire around the repair patch in order to heat the repaired portion and the periphery thereof with the repair patch. The patch is unvulcanized rubber, but the tire around the patch is vulcanized rubber. Therefore, if the patch and its periphery are uniformly heated by the heating pad, the vulcanized rubber around the patch may become over-vulcanized.

In the repairing method described in patent document 2, the pressure pad is made of a material having flexibility such as silicone, and deforms along the shape of the repaired portion when pressed in contact with the repaired portion of the damaged portion, but the backup plate is made of metal, and it is necessary to prepare the pressure pad and the backup plate corresponding to the curved surface of each repaired portion at a portion having a different curved surface such as the shoulder portion and the sidewall portion of the tire of the repaired portion.

On the other hand, particularly when the tread portion of the tire is damaged, when the shape of the land portion or groove portion of the tread portion is repaired and the repaired portion is subjected to press vulcanization, a method for maintaining the shape is required. Although not disclosed in patent documents 1 and 2, in order to maintain the shape of the land portion and groove portion of the tread at the time of press vulcanization, for example, it is necessary to separately prepare a mold member conforming to the pattern of the tread, and it is necessary to increase the cost for manufacturing a mold member conforming to the pattern of the tread for a corresponding tire, and to manage and repair many mold members. Therefore, these all result in low working efficiency.

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made in view of the above circumstances, and a main object thereof is to provide a tire repair method which can maintain the shape of a tire during press vulcanization in accordance with various types of tires and which is low in cost.

Another object of the present invention is to provide a tire repair method which does not require an air bladder or device conforming to the shape of a tire and a mold member conforming to the pattern of a tread, thereby reducing the cost and improving the work efficiency.

Another object of the present invention is to provide a tire repair method capable of shortening the time required for vulcanizing unvulcanized rubber of a repair material and suppressing excessive vulcanization of vulcanized rubber around the repair material.

Means for solving the problems

In order to achieve the above object, the present invention provides a method of repairing a tire, comprising disposing a repair material made of at least unvulcanized rubber at a damaged portion of a damaged tire, disposing a heating liner on a surface of the repair material disposed at the damaged portion of the tire, filling a plurality of filler members having different sizes into an inner side of the tire where the repair material is disposed at a tire circumferential portion divided in a tire circumferential direction, fastening and pressing the tire circumferential portion from the periphery, and heating the repair portion including the damaged portion by the heating liner to vulcanize the unvulcanized rubber of the repair material.

According to the above tire repairing method, since the plurality of filler members having different shapes are filled into the tire inner side of the tire circumferential direction portion where the repairing material is arranged, the filler members can be filled into the tire inner side appropriately in conformity with the inner surface shape of any tire, and therefore, the tire shapes of various tires can be maintained easily at the time of press vulcanization, and the tire can be repaired appropriately. In addition, since the filler member filled in the tire can be reused, the number of parts can be reduced.

According to one embodiment of the present invention, the repairing material is disposed from the tire inner side at a portion inside the tire reaching the damaged portion, the heating mat is disposed inside the repairing material, and the mat-surrounding packing member filled in the vicinity of the heating mat has a smaller cross-sectional area in the tire width direction cross-section than the other packing members.

As described above, the cross-sectional area of the cross-section in the tire width direction (cross-section taken along a plane including the tire rotation center axis) of the pad periphery filler member filled into the periphery of the heating pad provided on the inner side of the tire among the filler members is smaller than that of the other filler members, and therefore, a plurality of pad periphery filler members having a smaller cross-sectional area can be finely arranged on the irregularly-shaped surface of the periphery of the heating pad of the repair material covering the inner peripheral surface of the tire to uniformly apply pressure to the heating pad, and appropriate repair can be performed without deforming the repair material.

In addition, since the cross-sectional area of the filler member other than the filler member around the pad can be increased, the number of filler members to be filled into the inner side of the tire can be reduced, and the filling operation can be easily performed.

According to a preferred embodiment of the present invention, the above-mentioned tampon member comprises: a central stuffing component corresponding to the repairing material and pressurizing the repairing material; and an outer peripheral packing member that corresponds to the tire portion of the outer edge portion of the repair material and pressurizes the tire portion of the outer edge portion of the repair material, the outer peripheral packing member having a thermal conductivity greater than that of the central packing member.

In this way, since the heat conductivity coefficient of the outer circumferential filler member that pressurizes the tire portion corresponding to the outer edge portion of the repair material is larger than that of the central filler member that pressurizes the repair material corresponding to the repair material, the repair material disposed at the damaged portion of the tire is pressurized by the central filler member having a small heat conductivity coefficient, thereby suppressing heat dissipation and promoting vulcanization of the unvulcanized rubber, while the tire portion on the outer circumference of the repair material is pressurized by the outer circumferential filler member having a large heat conductivity coefficient, thereby promoting heat dissipation and suppressing vulcanization. Therefore, the unvulcanized rubber of the repair material can be vulcanized in a short time, the repair material and the vulcanized rubber around the repair material can be joined to each other, and the over-vulcanization of the vulcanized rubber around the repair material can be suppressed.

Preferably, the packing member has a rod shape and is inserted into the tire in a posture in which a direction perpendicular to a cross section in the tire width direction is a longitudinal direction.

In this way, since the rod-shaped packing member is filled into the tire inner side of the tire circumferential direction portion in a posture in which the direction perpendicular to the tire widthwise cross section is the longitudinal direction, the repair material in which one packing member is arranged at the damaged portion can be pressurized over the entire width in the direction perpendicular to the tire widthwise cross section, and therefore, the number of packing members filled into the tire inner side can be reduced, and the filling operation can be easily performed.

According to a preferred embodiment of the present invention, the tire is tightened by a winding belt at the tire circumferential direction portion filled with the filler member, thereby performing pressurization.

In this way, since the tape is wound around the tire circumferential direction portion filled with the filler member and tightened, the tire circumferential direction portion filled with the filler member can be tightened with good efficiency by the tape, and the filler member supports the repair material arranged at the damaged portion from the inside to maintain the shape of the tire, thereby allowing the repair material and the periphery thereof to be easily pressurized.

In one embodiment of the present invention, a tire is provided with a damaged portion as a tread portion, a fluid-state mold is prepared by mixing at least water and a water-insoluble material with plaster stone, the groove portion of the tread portion around the damaged portion having a tread shape including the groove portion repaired with the repair material is filled with the fluid-state mold, after the mold is cured and dried, the heating mat is disposed on the surface of the tread portion at the damaged portion, the damaged portion is pressurized, and the heated mat heats the damaged portion to vulcanize the unvulcanized rubber.

As described above, the shape of the tire having a damaged tread portion is repaired with a repair material made of at least unvulcanized rubber, a fluid-state profile is obtained by mixing at least water and a water-insoluble member with plaster, the groove portion of the tread portion around the repair portion repaired with the repair material is filled with the fluid-state profile, and after the profile is cured and dried, the repair portion is pressurized and vulcanized by heating with a heating pad. Therefore, the work efficiency can be improved and the cost can be reduced.

Further, since the mold material for filling the groove portion is a material obtained by mixing at least water and a water-insoluble material with plaster, and the ratio of plaster slurry (plaster slurry) composed of plaster and water or the like other than the water-insoluble material can be reduced by the water-insoluble material, the time required for curing and drying the mold material can be shortened, the time required for repairing the tire can be shortened, the workability can be improved, and the reduction in the number of steps can be achieved.

In one embodiment, the damaged portion is a tire width direction end portion of the tread portion,

the groove portion around the damaged portion is filled with the mold material, and a side surface of a repair portion of the repair portion, which is a tire width direction side surface, is covered with the mold material, and after the mold material is cured and dried, the repair portion is pressurized and heated to vulcanize the unvulcanized rubber.

By doing so, even when the tire width direction end of the tread portion of the tire is damaged and needs to be repaired, after the shape of the shoulder portion of the tire width direction end is repaired with the repair material, the groove portion around the repair portion is filled with the profile, and the repair portion side surface of the tire width direction side surface in the repair portion is covered with the profile, and after the profile is cured and dried, vulcanization and heating can be applied to the repair portion.

As the water-insoluble member, at least one of rubber, wood, and metal can be used.

By using rubber or wood as the water-insoluble member, it is possible to use rubber waste discarded in the repair work or inexpensive wood, and to reduce the cost. Further, by using a metal as the water-insoluble member of the mold material used for the repaired portion and the periphery thereof, the thermal conductivity from the heating mat to the repaired portion and the periphery thereof passing through the mold material becomes high, and the portion requiring the acceleration of vulcanization can be effectively vulcanized.

In a preferred embodiment, after a heating liner is disposed on the surface of the tread portion of the repair portion, the filler member is filled into the inside of the tire of a tire circumferential portion defined along the tire circumferential direction in which the repair portion exists, the tire circumferential portion is fastened and pressurized from the periphery, and the repair portion is heated by the heating liner to vulcanize the unvulcanized rubber.

In this way, since the pressure can be applied to the repair portion from the inner side of the tire by the packing member, an air bag or device having a shape that can be restrained from the inner side of the tire is not required, and the work efficiency can be further improved and the cost can be further reduced.

In a preferred embodiment of the present invention, a central heat conduction intermediate member is disposed on a surface of the repair material disposed in a damaged portion of a tire, a peripheral heat conduction intermediate member having a smaller thermal conductivity than the central heat conduction intermediate member is disposed on a surface of a tire in a peripheral portion of the repair material, and the heating mat is disposed on surfaces of the central heat conduction intermediate member and the peripheral heat conduction intermediate member disposed, and the damaged portion repaired by the repair material and its periphery are pressurized, and the heated mat heats the damaged portion to vulcanize unvulcanized rubber of the repair material.

A repair material made of at least unvulcanized rubber is arranged at a damaged portion of a damaged tire, a central heat conduction intermediate member is arranged on a surface of the repair material arranged at the damaged portion of the tire, a peripheral heat conduction intermediate member having a smaller heat conductivity than the central heat conduction intermediate member is arranged on a surface of the tire in the periphery of the repair material, a heating pad is arranged on surfaces of the central heat conduction intermediate member and the peripheral heat conduction intermediate member arranged, the periphery of the repaired portion repaired by the repair material is pressurized, and the repaired portion is heated by the heating pad to vulcanize the unvulcanized rubber of the repair material, whereby the peripheral heat conduction intermediate member arranged on the surface of the tire in the periphery of the repair material has a smaller heat conductivity than the central heat conduction intermediate member arranged on the surface of the repair material, and the repair material efficiently transfers heat and promotes vulcanization by the central heat conduction intermediate member having a larger heat conductivity than the heat conduction intermediate member, thereby bonding the tire to the peripheral vulcanized rubber, while suppressing heat transfer and vulcanization in the tire portion around the repair material by the peripheral heat transfer intermediary member having a smaller heat conductivity.

Therefore, the time for vulcanizing the unvulcanized rubber of the repair material can be shortened, and the overcuring of the vulcanized rubber around the repair material can be suppressed.

Preferably, the peripheral heat transfer intermediate member has a thickness greater than that of the central heat transfer intermediate member.

Since the peripheral heat conduction intermediating member is thicker than the central heat conduction intermediating member, the peripheral heat conduction intermediating member having a smaller heat conductivity coefficient is arranged in a thicker state in the tire portion around the repair material, so that heat transfer is further suppressed, vulcanization is further suppressed, and over-vulcanization of the vulcanized rubber around the repair material is reliably prevented.

According to a preferred embodiment of the present invention, a repair material made of at least unvulcanized rubber is disposed at a damaged portion of a tire, a heat conduction intermediate member is disposed on a tire surface of a peripheral portion of the repair material disposed at the damaged portion of the tire, heating pads are disposed on the surface of the repair material and the surface of the heat conduction intermediate member disposed, the periphery of the repaired portion repaired with the repair material is pressurized, and the repaired portion is heated with the heating pads to vulcanize the unvulcanized rubber of the repair material.

In this embodiment, the heat-conducting intermediate member is disposed on the surface of the tire in the periphery of the repair material disposed at the damaged portion of the tire, the heating pad is disposed on the surface of the repair material and the surface of the heat-conducting intermediate member disposed, the periphery of the repair portion repaired with the repair material is pressurized, and the repair portion is heated with the heating pad to vulcanize the unvulcanized rubber of the repair material.

Therefore, the unvulcanized rubber of the repair material can be vulcanized in a short time, and the vulcanized rubber around the repair material can be prevented from being excessively vulcanized.

ADVANTAGEOUS EFFECTS OF INVENTION

The present invention fills a plurality of filler members having different shapes into the inner side of a tire at a tire circumferential direction portion divided in the tire circumferential direction where a repair material is arranged, and therefore, for any tire, the filler members can be appropriately filled into the inner side of the tire while suppressing the inner surface shape thereof, and therefore, the shape of the tire can be easily maintained at the time of press vulcanization, and the repair can be appropriately performed.

Since the filler member filled in the tire can be reused, the cost can be reduced.

Drawings

Fig. 1 is a cross-sectional view in the tire width direction of a tire for a construction vehicle having a damaged side wall portion, the tire relating to a first embodiment of a tire repairing method of the present invention.

Fig. 2 is a main part sectional view for explaining a first step of repairing a damaged portion of the tire for a construction vehicle.

Fig. 3 is a main part sectional view for explaining the next process.

Fig. 4(a) is a side view of the inner patch member, and (B) is a front view thereof.

Fig. 5 is a main part sectional view for explaining the next process.

Fig. 6 is a main part sectional view of a different modification.

Fig. 7 is a partial side view of a tire for a construction vehicle in which a repairing material is disposed.

Fig. 8 is a partial side view of the tire for a construction vehicle in the vulcanization step.

Fig. 9 is a cross-sectional view of a tire for a construction vehicle in a vulcanization process.

Fig. 10 is a tire width direction cross-sectional view of a tire for a construction vehicle in a vulcanization process in the second embodiment of the present invention.

Fig. 11 is a perspective view of a representative tire repaired by the tire repairing method of the present invention.

Fig. 12 is a cross-sectional view in the tire width direction of the tire of fig. 11.

Fig. 13 is an explanatory view of a repair process according to a third embodiment of the present invention, and is a view showing a damaged state of a tire.

Fig. 14 is an explanatory view of the repair process of the third embodiment, showing a state in which the damaged portion on the tread side outside the carcass ply is removed.

Fig. 15 is an explanatory view of the repair process of the third embodiment, showing a state in which the damaged portion on the inner side of the carcass ply is removed.

Fig. 16 is an explanatory view of the repair process of the third embodiment, showing a state in which an unvulcanized patch member is applied to the ply layer from the inside.

Fig. 17 is an explanatory view of the repair process of the third embodiment, and is a view showing a state in which an unvulcanized tread rubber is filled and the shape is repaired.

Fig. 18 is an explanatory view of the repairing process of the third embodiment, showing a state in which the mold material is poured into the groove portion of the tread portion of the tire, the repaired portion, and the groove portion around the repaired portion.

Fig. 19 is an explanatory view of the repair process of the third embodiment, showing a state in which electric pads are arranged outside and inside the repaired portion of the tire and the periphery thereof, and a filler member is filled around the repaired portion of the tire inside the tire and the tire is fastened with a belt.

Fig. 20 is a perspective view showing a patch member used in the repair method of the third embodiment.

Fig. 21 is an explanatory view of the repairing process of the third embodiment, and is a view showing a state in which the profile is poured into the groove portion of the tread portion, the repaired portion, and the groove portion around the repaired portion.

Fig. 22 is a side view showing a tire circumferential direction portion divided in the tire circumferential direction in a region where a tire repair portion exists, and is a lower half portion of the tire.

Fig. 23 is a side view showing the lower half of the tire in the state of fig. 19.

Fig. 24 is a view similar to fig. 19 showing a modification of the third embodiment.

Fig. 25 is an explanatory view of a repair process according to the fourth embodiment of the present invention, and is a view showing a damaged state of a tire.

Fig. 26 is an explanatory view of the repair process of the fourth embodiment, showing a state where the damaged portion is removed neatly.

Fig. 27 is an explanatory view of a repair process of the fourth embodiment, and is a view showing a state where an unvulcanized tread rubber is filled in a portion that has been removed neatly and a shape is repaired.

Fig. 28 is an explanatory view of the repairing process of the fourth embodiment, showing a state in which the groove portion of the tread portion is filled with the profile, the groove portion of the periphery thereof is filled with the repair portion, and the profile is stacked to a predetermined thickness so as to cover the side surface of the repair portion located on the side surface in the tire width direction.

Fig. 29 is an explanatory view of a repairing process of the fourth embodiment, showing a state in which an electric heating mat is attached to a repaired portion of a tire and its periphery, and a packing member is filled in the tire around the repaired portion of the tire and fastened with a belt.

Fig. 30 is an explanatory view of the repairing process of the fourth embodiment, and is a view showing a state in which the repaired portion in the groove portion of the tread portion and the groove portion in the periphery thereof are filled with the profile, and the side surface of the shoulder portion after the repair is covered with the profile.

Fig. 31 is a cross-sectional view in the tire width direction of a tire for a construction vehicle in which a side wall portion has been damaged, and is a cross-sectional view in the tire width direction of a tire for a construction vehicle in a vulcanization step in a fifth embodiment of the present invention.

Fig. 32 is a view similar to fig. 31 showing a modification of the fifth embodiment.

Fig. 33 is a view similar to fig. 31 showing the sixth embodiment.

Fig. 34 is a main part sectional view of a tire for a construction vehicle in a vulcanization process in the seventh embodiment.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, a first embodiment of the present invention will be described with reference to fig. 1 to 9.

The present embodiment is applied to an Off-The-Road Radial Tire (Off-The-Road Radial Tire)1 for a large-sized construction vehicle.

Fig. 1 is a tire width direction cross-sectional view (a cross-sectional view taken along a plane including a tire rotation center axis) of a tire 1 for a construction vehicle in which a sidewall portion has been damaged.

The tire 1 for a construction vehicle includes a pair of left and right bead rings 2, 2 formed by winding a wire in a ring shape, and a carcass ply 3 is formed in an annular shape so that both side edges are wound around the bead rings 2, respectively, and the space between both side edges is expanded outward in the tire radial direction.

An inner liner portion 4 resistant to air permeation is formed on the inner surface of the carcass ply 3.

On the outer periphery of the crown portion of the carcass ply 3, a belt is wound in an overlapping plural manner to form a belt layer 5, and formed to cover a tread portion 6 thereon.

Side wall portions 7 are formed on the outer surfaces of both side portions of the carcass ply 3.

A bead portion 8 is provided so as to be wound around the bead ring 2 and cover the looped end of the folded carcass ply 3, and the inner side of the bead portion 8 is continuous with the inner liner portion 4 and the outer side thereof is continuous with the sidewall portion 7.

The carcass ply 3 is a cord rubber coating layer in which a plurality of ply cords are coated with a ply rubber.

As the ply cord, for example, a nylon cord, a terylene (trade name) cord, or a steel cord obtained by twisting a plurality of fine steel wires is used.

As a raw material of the carcass ply rubber, natural rubber, synthetic rubber, carbon black, and the like are used.

As a material of the inner part 4, butyl rubber or the like having high airtightness is used.

The belt of the belt layer 5 is formed in a belt shape by coating belt cords with belt rubber.

As shown in fig. 1, the tire 1 for a construction vehicle is damaged in the sidewall portion 7.

The damaged portion 10 scrapes off a part of the sidewall 7, cuts the carcass ply 3 inside, and a part of the inner liner 4 is broken to penetrate the sidewall of the tire.

A repair process of the tire 1 for a construction vehicle, which has received such damage, will be described with reference to the drawings.

First, as shown in fig. 2, the rubber around the defect portion of the damaged portion 10 of the sidewall 7 is removed from the tire outer side until the carcass ply 3 is exposed to form the outer repair recess 11 of a desired shape, and the rubber around the defect portion of the damaged portion 10 of the inner part 4 is removed from the tire inner side until the carcass ply 3 is exposed to form the inner repair recess 12 of a desired shape.

The rubber-removed and exposed surface of the carcass ply 3 is preferably finished by buffing since appropriate irregularities are provided for applying the repair material.

Next, referring to fig. 3, the inner patch member 22 as a repair material is attached to the inner surface of the recess and the exposed carcass ply 3 from the tire inner side in the inner repair recess 12 of the inner part 4.

The inner sheet member 22 may be bonded with an adhesive or the like as appropriate.

As shown in fig. 4(a) and (B), the inner patch member 22 is a member integrated in advance by bonding a patch-like inner liner repair rubber member 24 to a reinforcing sheet 23, and is a cord rubber-coated sheet in which a plurality of reinforcing cords 23a arranged in parallel with each other are coated with rubber, and in an unvulcanized state, it has a trapezoidal shape.

In the previous step, the inner repair recess 12 may be cut into a desired shape corresponding to the shape of the inner patch member 22.

The rubber of the reinforcing sheet 23 of the inner patch member 22 covering the reinforcing cords 23a is made of natural rubber, synthetic rubber, carbon black, or the like, and particularly, the same rubber as that used for the carcass ply 3 is preferable, but a different rubber may be used.

The reinforcing cord 23a may be a cord for reinforcing the carcass ply 3 that is cut, or may be a twisted cord, a single filament, or a plurality of filaments aligned.

Further, the reinforcing cord 23a is preferably thinner than the ply cord of the carcass ply 3.

If the cord is made of the same material and has the same diameter as the ply cord of the carcass ply 3, the reinforcing cord 23a is excessively stressed in tension, and the end portions are easily separated.

The lining repair rubber member 24 of the inner patch member 22 is preferably made of butyl rubber having high air tightness, as in the lining portion 4.

In this way, the inner repair recess 12 of the defect of the lining portion 4 is completely filled with the inner patch member 22, and the inner surface thereof is secured with air permeation resistance by the lining repair rubber member 24.

As shown in fig. 3, the reinforcing sheet 23 of the inner patch member 22 attached to the inner repairing recess 12 of the inner liner 4 of the side wall portion 7 covers the defective portion of the carcass ply 3 and the periphery thereof.

The reinforcing cords 23a of the reinforcing sheet 23 of the inner patch member 22 are arranged substantially parallel to the ply cords of the carcass ply 3 so as to compensate for the defective portions of the ply cords of the carcass ply 3.

Next, referring to fig. 5, the side repair rubber serving as a repair material is filled into the outer repair recess 11 from the outside of the tire as the side repair rubber portion 25.

The side repair rubber is unvulcanized rubber, and fills the empty recess of the outer repair recess 11 to form a side repair rubber portion 25.

The side repair rubber portion 25 is preferably made of the same material as the side wall portion 7, but a different material may be used.

In this way, the inner patch member 22 and the side repair rubber portion 25 (see fig. 5) which are uncured repair materials are arranged to be embedded in the damaged portion 10 of the side wall portion 7 of the tire 1 for a construction vehicle.

Further, the inner patch member 22 is disposed from the inside of the tire 1 for a construction vehicle and the side repair rubber portion 25 is filled, but depending on the degree of damage, as shown in fig. 6, the inner patch member 22 may be disposed from the inside of the tire 1 for a construction vehicle, and the outer patch member 21 as a reinforcing sheet formed by coating a reinforcing cord 21a with rubber may be further disposed from the outside and then the side repair rubber portion 25 may be filled.

As shown in fig. 7, the side repair rubber portion 25 filling the damaged portion 10 of the side wall portion 7 is exposed when viewed from the side of the tire 1 for a construction vehicle.

In fig. 7, a tire circumferential direction portion 1a of the repair material on which the side repair rubber portion 25 and the inner patch member 22 are arranged, which is defined in the tire circumferential direction, is shown in a dotted pattern.

Next, referring to fig. 9, in the tire circumferential direction portion 1a of the tire 1 for a construction vehicle, the outer electric heating pad 31 is disposed on the surface of the side repair rubber portion 25 filling the outer repair recess 11 of the damaged portion 10 and the tire outer surface (surface of the side wall portion 7) around the side repair rubber portion 25, and the inner electric heating pad 32 is disposed on the surface of the inner patch member 22 attached to the inner repair recess 12 of the damaged portion 10 and the tire inner surface (surface of the inner liner portion 4) around the inner patch member 22.

Referring to fig. 8 and 9, a wood chip 40 is filled as a filler member into the tire inner side of the tire circumferential direction portion 1a and the portion around the tire circumferential direction portion where the repair material (the inner patch member 22 and the side repair rubber portion 25) is arranged in the tire 1 for a construction vehicle. The wood chips 40 are filled into the inner side of the inner electric heating pad 32.

As the wood chips 40, a substantially cylindrical rod-shaped member is used.

The plurality of wood chips 40 having different outer diameters are filled into the tire inner side of the tire circumferential direction portion 1a and the portion around the tire 1 for a construction vehicle.

The rod-shaped wood chips 40 are inserted into the inner side of the inner electric heating mat 32 inside the tire 1 for a construction vehicle in a posture in which a direction perpendicular to a tire width direction cross section (a cross section when cut along a plane including a tire rotation center axis) is set as a longitudinal direction.

Fig. 9 is a tire width direction cross-sectional view of the tire 1 for a construction vehicle, showing a cross-section of a wood chip 40 filled into the inside of the tire.

As shown in fig. 9, the pad peripheral wood pieces 40s filled in the periphery of the inner electric heating pad 32 among the filled wood pieces 40 have a smaller cross-sectional area in the tire width direction than the other wood pieces 40.

Therefore, the pad peripheral wood chips 40s having a small cross-sectional area can be arranged finely on the surface of the inner circumferential surface of the tire, which has an irregular shape and covers the periphery of the inner electric heating pad 32 of the inner patch member 22 as a repair material.

As shown in fig. 9, a wood chip 40 is filled into the tire inner side of a tire circumferential direction portion 1a of a tire 1 for a construction vehicle so as to protrude from an opening between mutually opposing bead portions 8, a plate-shaped pressing member 41 is placed on the protruding wood chip 40, a cover plate 42 covers the outer electric heating pad 31 disposed on the side repairing rubber portion 25 and its periphery to a large extent, and the side repairing rubber portion 25 is filled in the outer repairing recess 11 of the damaged portion 10.

Next, as shown in fig. 8 and 9, the tire circumferential direction portion 1a of the tire 1 for a construction vehicle, in which the wood pieces 40 are filled, and the portion around the portion are wound and fastened by the tape 45 from the outside of the pressing member 41 and the cover plate 42.

For example, four bands 45 are wound, and each band 45 is fastened and fixed by passing the other end of the band 45 through a buckle 46 fastened to one end of the band 45 (see fig. 8).

The wood chips 40 filled into the tire inner side of the tire 1 for a construction vehicle by fastening the four tapes 45 are pressed by the pressing member 41, the wood chips 40 between the bead portions 8, 8 are sequentially pressed against the wood chips 40 on the tire inner side, and the pressure expanded from the inner side is applied to the inner liner portion 4 on the tire inner peripheral surface.

The pressure generated by fastening the four belts 45 is applied to the tread portion 6 and the sidewall portion 7 on the outer circumferential surface of the tire from the outside of the tire 1 for a construction vehicle.

Therefore, the side repairing rubber portion 25 filled in the outer repairing recess 11 of the damaged portion 10 is pressurized through the outer electric pad 31, and the inner patch member 22 attached to the inner repairing recess 12 of the damaged portion 10 is pressurized through the inner electric pad 32 by the wood chip 40.

In the present embodiment, the repaired portion is fastened by the four-band-bundle-shaped bands 45, but the number of bands and the width of the bands can be appropriately changed depending on the size and position of the repaired portion, and in some cases, the repaired portion can be fastened by one wide band 1 that sufficiently covers the repaired portion.

Then, current is passed through the outer electric heating mat 31 and the inner electric heating mat 32 to generate heat, thereby heating and vulcanizing the side repair rubber portion 25 and the inner patch member 22, which are repair materials made of unvulcanized rubber, and simultaneously, joining the repair materials of the side repair rubber portion 25 and the inner patch member 22 and vulcanized rubber around the repair materials.

In this way, the repair of the damaged portion 10 of the tire 1 for a construction vehicle is completed.

In the first embodiment of the tire repairing method according to the present invention described in detail above, the following effects are exhibited.

As shown in fig. 9, the pad peripheral wood pieces 40s filled in the periphery of the inner electric heating pad 32 among the wood pieces 40 as the packing members have a smaller cross-sectional area when cut along a plane including the tire rotation center axis than the other wood pieces 40, and therefore, a plurality of pad peripheral wood pieces 40s having a small cross-sectional area can be finely arranged on the surface of the inner circumferential surface of the tire having an irregular shape covering the periphery of the inner electric heating pad 32 of the inner patch member 22, and the pressure can be uniformly applied to the inner electric heating pad 32, and the inner patch member 22 can be appropriately repaired without being deformed.

Further, the wood chips 40 other than the wood chips 40s around the cushion can have a larger cross-sectional area, and therefore the number of the wood chips 40 to be filled into the tire can be reduced, and the filling operation can be facilitated.

Further, the wood chips 40 filled inside the tire can be reused, and thus cost reduction can be achieved.

As shown in fig. 8 and 9, since the rod-shaped wood pieces 40 are filled into the tire with the longitudinal direction thereof directed in the direction perpendicular to the cross section in the tire width direction, the inner patch member 22 in which one wood piece 40 is arranged at the damaged portion 10 can be pressed over the entire width in the direction perpendicular to the cross section in the tire width direction, and therefore the number of the wood pieces 40 filled into the tire can be reduced, and the filling operation can be easily performed.

As shown in fig. 8 and 9, the tape 45 is wound around and fastened to the tire circumferential direction portion 1a filled with the wood pieces 40 and the portion around the tire circumferential direction portion. Therefore, the tire circumferential direction portion 1a of the tire 1 for a construction vehicle filled with the wood pieces 40 can be fastened efficiently by the outer tape 45, and the wood pieces 40 support the inner patch member 22 and the side repair rubber portion 25 as the repair material arranged at the damaged portion 10 from the inside to maintain the shape of the tire, and the repair material and the periphery thereof can be simply pressurized.

In the first embodiment, the wood chips are used as the filler member filled in the tire, but the present invention is not limited to the wood chips, and any material can be used if it can press the repairing material filled in the damaged portion without thermal deformation while maintaining the shape of the tire.

The cross-sectional shape of the packing member such as a wood chip may be a shape other than a substantially circular shape, for example, a polygonal shape such as an ellipse, a semicircle, a triangle, or a quadrangle, or a shape obtained by combining a polygonal shape and a circular arc.

Next, a tire repair method according to a second embodiment will be described below with reference to fig. 10.

In the first embodiment described above, the wood pieces 40 are filled as the filler members inside the inner electric pad 32 inside the tire of the tire 1 for a construction vehicle, but the second embodiment is the same as the first embodiment except that the filler members having different thermal conductivity are used depending on the filling place.

Accordingly, components other than the tampon component are the same and denoted by the same reference numerals.

The packing member in the second embodiment is composed of two kinds of wood pieces 50 having a substantially cylindrical rod shape and iron rods 51 having an iron cylindrical shape and a thermal conductivity larger than that of the wood pieces 50.

Referring to fig. 10, as a central packing member for pressurizing the inner patch member 22 corresponding to the inner patch member 22 as the repair material via the inner electric heating pad 32, a wood chip 50 (a blank circular cross section in fig. 10) is used, and as an outer packing member for pressurizing the tire portion of the outer periphery of the inner patch member 22 corresponding to the tire portion of the outer periphery of the inner patch member 22 via the inner electric heating pad 32, an iron rod 51 (a circular cross section with a dotted pattern in fig. 10) is used.

In the repairing step, similarly to the first embodiment, in the step of filling the filler member into the inner side of the inner electric pad 32 on the inner side of the tire 1 for a construction vehicle, as shown in fig. 10, the wood chips 50 having a small cross-sectional area are distributed at the portions corresponding to the inner patch members 22 on the inner side of the tire via the inner electric pad 32, the iron rods 51 having a cross-sectional area as small as the wood chips 50 having a small cross-sectional area are distributed at the portions corresponding to the tire portions near the outer edge of the inner patch members 22 via the inner electric pad 32, and the wood chips 50 having a large cross-sectional area are filled in the inner space of the other tire.

Further, since the packing member is filled in a posture in which the direction perpendicular to the cross section in the tire width direction is the longitudinal direction, the short iron rods 51 are arranged on both sides of the short wood pieces 50 at positions across the outer edge of the inner patch member 22.

The inner patch member 22 and the side repair rubber portion 25, which are the repair materials embedded in the repair recess of the damaged portion 10, are pressurized by fastening the belt 45 to the tire circumferential direction portion 1a via the inner electric heating pad 32 and the outer electric heating pad 31.

Then, the current flows to the outer electric heating mat 31 and the inner electric heating mat 32 to generate heat, thereby heating and vulcanizing the side repair rubber part 25 and the inner patch member 22, which are repair materials made of unvulcanized rubber, and simultaneously, bonding the repair materials and the vulcanized rubber around the repair materials.

In this heat vulcanization step, the repair material (inner patch member 22, side repair rubber portion 25) disposed at the damaged portion 10 of the tire is pressurized by the wood chips 50 having a small thermal conductivity through the inner electric heating pad 32, so that the vulcanization of the unvulcanized rubber of the repair material (inner patch member 22, side repair rubber portion 25) is promoted by suppressing the heat dissipation, while the tire portion along the outer edge of the repair material is pressurized by the iron rods 51 having a large thermal conductivity through the inner electric heating pad 32, so that the heat dissipation is promoted and the vulcanization is suppressed.

Therefore, the unvulcanized rubber of the repair material (the inner patch member 22 and the side repair rubber portion 25) is vulcanized in a short time, and the repair material and the vulcanized rubber around the repair material can be joined to each other, and the over-vulcanization of the vulcanized rubber around the repair material can be suppressed.

The filler member to be filled into the tire is not limited to the wood chip and the iron rod, and two types of filler members having different thermal conductivity coefficients may be used as long as the filler member can press the repair material filled into the damaged portion without thermally deforming the repair material while maintaining the shape of the tire.

The first and second embodiments described above are repairing methods in the case where the sidewall portion 7 of the tire 1 for a construction vehicle is damaged, and a repairing method of a third embodiment in the case where the tread portion of the tire 1 is damaged will be described below with reference to fig. 11 to 23. In the third embodiment, the same or equivalent components as those used in the first embodiment are denoted by the same reference numerals.

Fig. 11 shows a typical tire to which the tire repairing method according to the third embodiment is applied, and is an ultra-large radial tire such as a construction vehicle tire, for example. Fig. 12 shows a cross-sectional view of the tire 1 in the tire width direction.

The tire 1 includes, as in the tire shown in fig. 1: a bead portion 8 in which a pair of right and left annular bead rings 2 are embedded; a carcass ply 3 annularly stretched between the pair of bead portions 8; a belt layer 5 contacting the radially outer side of the carcass ply 3; a tread portion 6 contacting the outer peripheral surface of the belt 5, and a sidewall portion 7 covering a side portion of the tire 1.

In order to increase the traction force by increasing the friction with the ground, the tread portion 6 is formed with a groove portion 6b, and a region which is surrounded by the groove portion 6b or surrounded by the groove portion 6b and the side edge 6c of the tread portion 6 and becomes the outer surface of the tire becomes a land portion 6 a.

In the method of repairing a tire according to the third embodiment, the tread portion 6 as shown in fig. 13 is cut and damaged at the damaged portion 10, and the damaged portion reaches the carcass ply 3 and the belt layer 5 inside the tire 1, and the tire 1 having been cut off is repaired.

As shown in fig. 14 and 15, the damaged portion 10 of the tread portion 6 is searched, and the tread rubber and the lining rubber around the damaged portion 10 are removed using a groover or the like, not shown. At this time, the tread rubber and the inner liner rubber are removed and the surface is finished while paying attention to the fact that only the carcass ply 3 remains larger than a predetermined radial range around the damaged portion 10 so that the damaged portion 10 of the tread portion 6 and the inner liner portion 68 does not remain.

As shown in fig. 16, a patch member 22 as a repair material is attached to the exposed radially inner side of the carcass ply 3 so as to cover the entire damaged portion 10 of the carcass ply 3. When the patch member 22 is stuck to the carcass ply 3, an adhesive or the like may be used. In the present embodiment, the patch member 22 is attached from the radially inner side of the tire 1, but may be attached to both the inner side and the outer side depending on the degree of damage.

As shown in fig. 20, the patch member 22 used in the tire repair method of the present embodiment is a cross-shaped laminate of unvulcanized rubber, and includes a reinforcing laminate 23 in which reinforcing cords are arranged, and an inner liner repair rubber portion 24 integrally bonded to the reinforcing laminate 23.

The reinforcing laminate 23 includes: two lower laminates 22a and 22 b; and two upper laminates 22c and 22d which are overlapped on the lower laminate 22b and have a cross shape smaller than the lower laminates 22a and 22 b. These laminates 22a, 22b, 22c, and 22d are reinforcing cords 22a arranged in parallel₂、22b₂、22c₂、 22d₂Comprising an unvulcanized rubber portion 22a₁、22b₁、22c₁、22d₁A member formed by covering, a reinforcing cord 22a₂、 22b₂、22c₂、22d₂The laminated bodies are arranged so as to be perpendicular to each other in a plan view. In the present embodiment, the upper laminate and the lower laminate are stacked in two layers, respectively, but the number of stacked laminates may be even or odd, and the number of stacked laminates may be different between the upper laminate and the lower laminate.

The lining repair rubber portion 24 adhered to the lower surface of the reinforcing laminate 23 is a sheet-like member made of unvulcanized lining rubber, is formed in the same cross shape as the lowermost surface of the reinforcing laminate 23, and is integrated with the reinforcing laminate 23 to form the patch member 22.

The patch member 22 used in the present embodiment is a laminate, but may be a member composed of one layer instead of a laminate, and the size may be different between the upper laminate and the lower laminate, but all laminates may have the same size, and the shape of the laminate may be a square or rectangular shape instead of a cross.

As shown in fig. 17, outside the carcass ply 3 (see fig. 16) exposed by removing the tread rubber, the unvulcanized repaired tread rubber 25 as a repairing material which is in a fluid state by being crushed and heated with a spatula or the like fills and buries the defective portion, and the shape of the land portion 6a and the groove portion 6b of the defective tread portion 6 is substantially restored to the same shape as that of the tire 1 in an unused state in accordance with the shape before the failure of the tire 1. The new tread rubber 25 used for the repair may be a tread rubber of the same material as the tread rubber before the repair, or may be a tread rubber of a different material. As described above, the shape of the damaged portion of the tire having the damaged tread portion is repaired by the unvulcanized rubber patch member 22 and the unvulcanized repaired tread rubber 25 as the repairing materials.

When the repair portion 64 repaired with the unvulcanized rubber as described above is vulcanized by pressing and heating, the shape 61 for maintaining the shape of the repair portion 64 is prepared. The operation of preparing the profile 61 may be performed after the completion of the above-described repair operation, or may be performed simultaneously with the above-described repair operation.

The shape 61 is obtained by mixing powdered plaster of paris as a base material with water to prepare a plaster slurry (plaster slurry), and mixing the plaster slurry with a water-insoluble material such as wood, rubber chips, metal, or the like. Plaster of paris is also known as calcium sulfate and 1/2 hydrates and, when reacted with water, becomes dihydrate gypsum (calcium sulfate, dihydrate) and sets.

The ratio of water to be added to the plaster when producing the plaster slurry is not particularly limited, and can be selected according to the required fluidity. And various additives such as a material for improving adhesiveness may be added as necessary.

The water-insoluble member may be in the form of powder, granules, or larger than that, and may not be fixed in shape, using wood, rubber dust, metal, or the like. Since the water-insoluble material is mixed in the gypsum slurry, the ratio of the gypsum slurry in the required form 61 can be reduced, and hence the time for curing and drying the form 61 can be shortened.

Since the time required for curing and drying the mold material 61 can be shortened as the ratio of the water-insoluble material to the gypsum slurry is increased, the time required for curing and the strength of the cured mold material 61 required for curing the unvulcanized rubber can be appropriately changed in consideration of the time required for curing. When the water-insoluble material is in the form of small particles such as powder or granules, the water-insoluble material may be mixed with powdered plaster of paris and then the mixture may be stirred with water to obtain the shaped material 61.

As shown in fig. 18 and 21, the mold material 61 having fluidity before curing thus obtained is poured so as to fill the groove portion 6b around the repaired portion 64 having the repaired shape, and the surface of the mold material 61 and the surface of the land portion 6a are formed to be substantially flush with each other.

The mold material 61 having fluidity thus flowed into the groove portions 6b is left to stand and solidified and dried, and the excess water contained in the mold material 61 is removed. Since the water-insoluble material is contained in the mold material 61, the amount of the gypsum slurry flowing into the mold material 61 having the same groove portion 6b can be reduced as compared with the mold material 61 not containing the water-insoluble material, and hence the time until the mold material 61 is cured and dried can be shortened.

Next, after the profile 61 is cured and dried, as shown in fig. 19, the outer electric heating pad 31 and the inner electric heating pad 32, which are heating pads, are arranged on both the outer side and the inner side in the radial direction of the tire 1 so as to cover the periphery of the repaired portion 64 of the tire 1. An outer electric heating pad 31 is disposed along the outer surface of the tread portion 6 of the repaired portion 64 repaired with the repair rubber material 25 and the land portion 6a in the vicinity thereof, and the outer surface of the profile 61 filling the groove portion 6b, on the outer side of the tire 1. An inner electric heating pad 32 is disposed on the inner side of the tire 1 in the repair part 64 where the inner part 68 is repaired by the unvulcanized inner patch member 22 and the inner wall surface around the repair part. In the present embodiment, the electric heating pads 31, 32 are disposed on both the outer side and the inner side of the tire 1, but may be disposed on only one of the inner side or the outer side depending on the state and position of the repair portion 64.

As shown in fig. 19 and 23, the filler member 40 is filled into the repaired portion 64 of the tire 1 and the inner side of the periphery thereof, and is overlapped in the center direction of the tire 1 so as to exceed the opening between the bead portions 8 of the tire 1. The packing member 40 is filled at least inside the tire at a tire circumferential direction portion 1a defined in the tire circumferential direction where the repair portion 64 exists. The tire circumferential direction portion 1a is shown in a dotted pattern in fig. 22, and as described above, a portion of the tire 1 where the repair portion 64 exists is referred to as a portion divided in the tire circumferential direction.

The packing member 40 is a rod-shaped substantially cylindrical member, and wood chips are used in the present embodiment, but may be made of metal, heat-resistant plastic, or the like. In the present embodiment, the cross-sectional shape of the packing member 40 is substantially circular, but the cross-sectional shape of the packing member 40 may be other than circular, and may be, for example, an ellipse, a semicircle, a polygon such as a triangle, a quadrangle, or the like, a shape in which a polygon and an arc are combined, or the like. When the electric pad 32 is disposed inside the repair part 64 and the periphery thereof, the electric pad 32 is filled in such a manner as to be pressed by the packing member 40. The plug member 40 filled in this manner and rising from the opening between the bead portions 8 is covered from above by a plate-shaped pressing member 41 (fig. 23), and the electric heating mat 31 disposed outside the tire 1 is covered to the peripheral region thereof by a cover plate 42.

Then, the long belt 45 as a fastening member is wound from the outside of the pressing member 41 and the cover plate 42, and at least the portion of the tire 1 included in the tire circumferential direction portion 1a where the packing member 40 is filled is fastened so as to apply a predetermined pressure to the repairing portion 64, and is fixed through the other end of the belt 45 in the buckle 46 fixed to one end of the belt 45. In the present embodiment, four belts 45 are used as the fastening members, but the number of belts and the width of the belts can be changed as appropriate depending on the size and position of the repair portion 64. Further, instead of using a belt, a wide belt may be used as the fastening member.

The repair portion 64 of the tire 1 is pressurized to a predetermined pressure, and then current is applied to the electric pads 31 and 32 to generate heat. The temperature of the electric heating pads 31, 32 is controlled to a temperature suitable for vulcanizing unvulcanized rubber used for repairing the tire 1, and the repairing portion 64 is vulcanized by applying pressure and heat for a predetermined time, and the repairing portion 64 is joined to the surrounding portion.

After the pressure vulcanization is performed on the repaired portion 64 for a predetermined time in this manner, the fastening member 45 and the pressing member 41 are removed from the tire 1, the filler member 40 is removed from the inside of the tire 1, and the cover plate 42 and the electric heating pads 31 and 32 are removed from the repaired portion 64. Then, the mold 61 filled in the groove portion 6b around the repairing portion 64 is crushed and removed from the tread portion 6, and the repairing work of the tire 1 is completed.

The method of repairing a tire according to the third embodiment of the present invention is a method of repairing a damaged portion of a tire 1 damaged by a tread portion 6 as described above by using at least a tread rubber 25 and a patch member 22 as a repairing material made of unvulcanized rubber, preparing a fluidized profile 61 by mixing water and a water-insoluble member with plaster of paris as a base material, filling a groove portion 6b of the tread portion 6 in the periphery of the repairing portion 64 with the fluidized profile 61, disposing electric pads 31 and 32 in the peripheries of the repairing portion 64 and the repairing portion 64 after the curing and drying of the profile 61, pressurizing the periphery of the repairing portion 64, heating the unvulcanized rubber by the electric pads 31 and 32 to vulcanize the unvulcanized rubber, and during vulcanization, the unvulcanized tread rubber 25 in the repairing portion 64 can be held in a predetermined shape without preparing a metal mold in accordance with the kind of the tire and the shape of the tread, the work efficiency can be improved and the cost can be reduced.

Further, since the mold 61 filling the groove portion 6b of the tread portion 6 is a member obtained by mixing at least water and a water-insoluble material with plaster, the ratio of plaster slurry (plaster slurry) composed of plaster and water or the like other than the water-insoluble material can be reduced by the water-insoluble material, and therefore, the time required for curing and drying the mold 61 can be shortened, the time required for repairing the tire 1 can be shortened, the workability can be improved, and the cost can be reduced.

Further, since at least one or more of rubber, wood, and metal can be used as the water-insoluble member, rubber waste discarded in the repair work or inexpensive wood can be used, and cost reduction can be achieved. Further, by using a metal as the water-insoluble member of the shape 61 used for the repair portion 64, the thermal conductivity from the electric heating pads 31 and 32 to the repair portion 64 passing through the shape 61 becomes high, and the portion requiring the acceleration of vulcanization can be effectively vulcanized.

Further, since the electric heating pads 31 and 32 are arranged inside the tire circumferential direction portion 1a defined in the tire circumferential direction where the repairing portion 64 exists, the filler member 40 is filled, the portion of the tire in which the filler member 40 is laid is fastened and pressurized by the fastening member 45 from the periphery, and the repairing portion 64 is heated by the electric heating pad 32 arranged inside the repairing portion 64 together with the electric heating pad 31 arranged outside the repairing portion 64 of the tire 1, the repairing portion 64 can be heated from the outside and the inside of the tire 1, and the unvulcanized rubber of the repairing portion 64 can be sufficiently vulcanized.

In the present embodiment, the tire 1 having the repairing portion 64 reaching the carcass ply 3 and the belt layer 5 is repaired, but in the method for repairing a tire of the present invention, it is possible to repair a tire having a damaged state in which the damaged portion does not reach the carcass ply 3 or the belt layer 5, or to repair a tire having a shape repaired without using the patch member 22 and filling the unvulcanized tread rubber 25 having a shallow damaged portion.

Fig. 24 is a view corresponding to fig. 19 relating to the tire repairing method according to the third embodiment, and shows a modification of the third embodiment. In the embodiment shown in fig. 19, the shape and size of the padding member 40 filled into the repair part 64 of the tire 1 and the inner side of the periphery thereof are the same, but in the modification shown in fig. 24, the wood chips 40 as the padding member filled into the inner side of the inner electric heating mat 32 are composed of the padding peripheral wood chips 40s filled into the periphery of the inner electric heating mat 32 and the other wood chips 40, and the cross-sectional area of the tire width direction cross-section of the padding peripheral wood chips 40s is smaller than that of the other wood chips 40. Therefore, the plurality of pad periphery wood chips 40s having a small cross-sectional area can be arranged finely on the surface of the inner peripheral surface of the tire, which has an irregular shape covering the periphery of the inner electric pad 32 of the inner patch member 22 as a repair material.

In the third embodiment and its modified examples, as the outer periphery filler member for applying a pressing force to the tire portion on the outer periphery of the inner patch member 22 via the inner electric heating pad 32 to press the tire portion on the outer periphery of the inner patch member 22, an iron rod may be used.

In this case, the tire portion filled with the repair material (inner patch member 22, repair rubber portion 25) is pressurized by the iron rod having a large thermal conductivity through the inner electric heating pad 32 to promote heat dissipation, and vulcanization of the vulcanized rubber around the repair material is suppressed, and over-vulcanization is suppressed.

In the above embodiment, the tire having the damaged portion reaching the carcass ply was repaired, but in the method for repairing a tire of the present invention, even in the case of a tire in a damaged state in which the damaged portion does not reach the carcass ply or the belt layer, the repair rubber is filled into the repair recess, and the tire can be repaired in the same manner.

In the above embodiment, an air bladder having a small thermal conductivity may be provided outside the electric pad disposed on the surface of the repair rubber portion such as a patch member and the periphery thereof. In this case, the pressurization by the air bladder is further applied to the unvulcanized rubber at the repair site, and the heat insulating effect of the air bladder can also promote the vulcanization of the unvulcanized rubber at the repair site.

Further, a heat insulator such as a rubber sheet for protecting a conveyor belt may be provided outside the air bag.

Hereinafter, a tire repair method according to a fourth embodiment will be described with reference to fig. 25 to 30. In the tire repairing method of the present embodiment, as shown in fig. 25, the tire 1 in which the vicinity of the tire width direction end of the tread portion 6 is damaged and a part of the land portion 6a and a part of the shoulder portion 63 of the tread portion 6 are broken is repaired. The tire 1 used in the present embodiment has a damaged portion different from the damaged portion of the tire 1 used in the third embodiment, but since other portions are the same, the description will be given using the same reference numerals for the same portions.

As shown in fig. 26, the damaged portion 67 (fig. 25) of the tread portion 6 and the shoulder portion 63 of the tire 1 is searched, and the damaged portion 67 and the tread rubber around the damaged portion 67 are removed radially (in an arc shape) using a groover or the like with the damaged portion 67 as a center. At this time, the tread portion 6 is removed while paying attention to the fact that the damaged portion 67 does not remain.

As shown in fig. 27 and 30, an unvulcanized tread rubber 57 as a repair material heated and fluidized to fill the defective portion is deposited on the tread portion 6 and the shoulder portion 63 side of the tire 1, and the shape of the land portion 6a and the groove portion 6b of the defective tread portion 6 is repaired to the shape before the failure of the tire 1 and the shape of the tire in a substantially unused state. The unvulcanized tread rubber 57 may be a tread rubber made of the same material as the tread rubber before repair or a tread rubber made of a different material.

When the shape-restored portion 58 of the unvulcanized tread rubber 57 is heated under pressure and vulcanized as described above, a mold material 61 for retaining the shape of the unvulcanized rubber is prepared. The profile 61 can be obtained by the same operation as in the third embodiment. The operation of preparing the profile 61 may be performed after the completion of the above-described repair operation, or may be performed simultaneously with the above-described repair operation.

As shown in fig. 28 and 30, the thus obtained material 61 having fluidity before solidification is filled so as to fill the groove portions 6b around the repaired portion 58 having the repaired shape. Then, the profile 61 is stacked in a predetermined thickness from the tire side direction so as to cover a repair part side surface 58a located on the tire width direction side surface of the repair part 58. The surface 61a of the profile 61 covering the repair portion side surface 58a in the tire radial direction is formed so as to be continuous with the tread of the tread portion 6. As shown in fig. 30, in the restored portion 58 having the restored shape, the land portion 6a located at the end in the tire width direction is surrounded by the profile 61 that has flowed into the groove portion 6b and the profile 61 that has accumulated on the side surface in the tire width direction, and the shape of the land portion 6a is maintained.

The fluid mold material 61 filling the groove portion 6b in this manner is placed and deposited on the outer edge in the tire width direction, and excess water contained in the mold material 61 is removed while curing and drying the mold material 61.

Next, after the profile 61 is cured and dried, as shown in fig. 29, the electric heating pad 31 is disposed from the outside of the tire 1 so as to be positioned at the repair part 58 of the tire 1 and the periphery thereof. The electric heating pad 31 is disposed along the outer surfaces of the repair portion 58 repaired by the repair material of the tread portion 6 and the tread portion 6, the shoulder portion 63, and the side wall portion 7 in the vicinity thereof, the profile 61 filling the groove portion 6b, and the outer surface of the profile 61 deposited on the outer edge in the tire width direction. In the present embodiment, the electric heating pad 31 is disposed only on the outer side in the radial direction of the tire, but may be disposed on both the inner side and the outer side depending on the state and position of the repair portion 58.

As shown in fig. 29, the repair portion 58 of the tire 1 and the inner side of the periphery thereof are filled with the filler member 40, and are overlapped on the center side of the tire 1 so as to exceed the opening between the bead portions 8 of the tire 1, as in the third embodiment. The packing member 40 has a substantially cylindrical rod shape, and wood chips are used in the present embodiment, but may be made of metal, heat-resistant plastic, or the like. In the case where the repair part 58 and the inner side of the periphery thereof are provided with the electric pad, the packing member 40 is filled in such a manner as to press the electric pad. The plug member 40 filled in this manner and having a raised opening between the movable bead portions 8 is covered from above by the plate-like pressing member 41, and the electric heating pad 31 disposed outside the tire 1 is covered around it by the cover plate 42.

Then, as in the third embodiment (see fig. 23), the long belt 45 of the fastening member is wound from the outside of the pressing member 41 and the cover plate 42 to fasten the repair part 58 of the tire 1 at a predetermined pressure, and the portion of the tire 1 filled with the packing member 40 is fixed through the other end of the belt 45 in the buckle 46 fixed to one end of the belt 45. In the present embodiment, four belts 45 are used as the fastening members, but the number of belts and the width of the belts can be appropriately changed according to the size and position of the repair portion. Further, as the fastening member 45, a wide tape may be used instead of the belt.

After the repair portion 58 of the tire 1 is pressurized at a predetermined pressure, a current is applied to the electric pad 31 to generate heat. The temperature of the electric heating pad 31 is controlled to a temperature suitable for vulcanizing unvulcanized rubber used for repairing the tire, the repairing portion 58 is vulcanized by applying pressure and heat for a predetermined time, and the repairing portion 58 is joined to the surrounding portion.

After the repair part 58 is pressure-vulcanized for a predetermined period of time, the fastening member 45 and the pressing member 41 are removed from the tire 1, the plug member 40 is taken out from the inside of the tire 1, and the cover plate 42 and the electric heating pad 31 are removed from the repair part 58. Thereafter, the mold 61 filled in the groove portion 6b around the repair portion 58 and the mold 61 covering the repair portion side surface 58a are crushed and removed from the tread portion 6, and the repair work of the tire 1 is completed.

In the fourth embodiment, after the shape of the shoulder portion 63 is restored by the tread rubber 57 before vulcanization, the groove portion 6b of the restoration portion 58 and the region thereof is filled with the mold material, the restoration portion side surface 58a is covered with the mold material 61 in a flowing state, and the unvulcanized rubber is vulcanized after the mold material 61 is cured, so that even when the shoulder portion 63 of the tread portion 6 of the tire 1 is damaged and needs to be repaired, the repair can be performed without preparing a metal mold or an air bag in accordance with the type of the tire or the shape of the tread portion, and the workability can be further improved, and the cost reduction can be further achieved.

In the third and fourth embodiments described above, air pockets having a small thermal conductivity may be provided outside the electric pads 31 and 32 disposed on the surface of the patch member 22 or other repair material. The pressurization by the air bag is further applied to the unvulcanized rubber at the repair site, and the heat insulating effect of the air bag can also promote the vulcanization of the unvulcanized rubber at the repair site.

Further, a heat insulating material such as a rubber sheet for protection may be provided outside the air bag, thereby further improving the heat insulating effect.

A tire repair method according to a fifth embodiment of the present invention will be described below with reference to fig. 31. In the fifth embodiment, the outer heat conduction intermediate member 71 is disposed on the surface of the side repair rubber portion 25 of the outer repair recess 11 filled in the damaged portion 10 (see fig. 2) and the tire outer surface (surface of the side wall portion 7) around the side repair rubber portion 25 in the tire circumferential direction portion 1a of the tire 1 for a construction vehicle, and the inner heat conduction intermediate member 72 is disposed on the surface of the inner patch member 22 attached to the inner repair recess 12 (see fig. 2) of the damaged portion 10 and the tire inner surface (surface of the inner liner portion 4) around the inner patch member 22.

The outer heat conduction intermediating members 71 are composed of a central heat conduction intermediating member 71c disposed on the surface of the side repair rubber portion 25 and a peripheral heat conduction intermediating member 71s disposed on the tire surface (the surface of the side wall portion 7) at the periphery of the side repair rubber portion 25, and the central heat conduction intermediating member 71c and the peripheral heat conduction intermediating member 71s have different heat conductivities.

The central heat-transfer intermediate member 71c of the outer heat-transfer intermediate member 71 is a bag body formed by packing a metal piece m (indicated by a black dot ● in fig. 31) such as iron into a cloth bag or the like, and the peripheral heat-transfer intermediate member 71s of the outer heat-transfer intermediate member 71 is a bag body formed by packing a wood chip w (indicated by a blank circle in fig. 31) into a cloth bag or the like.

Therefore, the peripheral heat transfer medium member 71s as the bag body into which the wood chips w are put has a smaller heat conductivity than the central heat transfer medium member 71c as the bag body into which the metal sheets m are put.

Similarly, the inner heat conduction intermediate member 72 is composed of a central heat conduction intermediate member 72c disposed on the surface of the inner patch member 22 and a peripheral heat conduction intermediate member 72s disposed on the tire inner surface (the surface of the inner liner portion 4) on the periphery of the inner patch member 22, and the central heat conduction intermediate member 72c and the peripheral heat conduction intermediate member 72s have different thermal conductivities.

The central heat transfer intermediate member 72c of the inner heat transfer intermediate member 72 is a bag body formed by packing a metal piece m (indicated by a black dot ● in fig. 31) such as iron into a cloth bag or the like, and the peripheral heat transfer intermediate member 72s of the inner heat transfer intermediate member 72 is a bag body formed by packing wood chips w (indicated by a blank circle in fig. 9) into a cloth bag or the like.

Therefore, the peripheral heat transfer medium member 72s as the bag body into which the wood chips w are put has a smaller heat conductivity than the central heat transfer medium member 72c as the bag body into which the metal sheet m is put.

As shown in fig. 31, the outer electric heating pad 31 is disposed on the surface of the outer heat transfer mediating member 71 disposed on the outer surface of the tire at the damaged portion of the tire 1 for a construction vehicle, and the inner electric heating pad 32 is disposed on the surface of the inner heat transfer mediating member 72 disposed on the inner surface of the tire at the damaged portion.

Further, a wood chip 40 is filled as a filler member into the tire inner side of the tire circumferential direction portion 1a and the vicinity thereof where the repair material (the inner patch member 22, the side repair rubber portion 25) is arranged of the tire 1 for a construction vehicle. The wood chips 40 are filled into the inner side of the inner electric heating pad 32.

The wood chips 40 are formed into a substantially cylindrical rod-like member. The plurality of wood chips 40 having different outer diameters are filled into the tire inner side of the tire circumferential direction portion 1a and the portion in the vicinity thereof of the tire 1 for a construction vehicle.

The rod-shaped wood chips 40 are inserted into the inner side of the inner electric heating mat 32 inside the tire 1 for a construction vehicle in a posture in which a direction perpendicular to a tire width direction cross section (a cross section when cut along a plane including a tire rotation center axis) is set as a longitudinal direction.

Fig. 31 is a cross-sectional view of the tire 1 for a construction vehicle in the tire width direction, and a wood piece 40 filled into the inside of the tire shows a cross-section.

As shown in fig. 31, the pad peripheral wood pieces 40s filled in the periphery of the inner electric pad 32 among the filled wood pieces 40 have a smaller cross-sectional area in the tire width direction than the other wood pieces 40.

Therefore, the plurality of pad peripheral wood chips 40s having a small cross-sectional area can be arranged finely on the surface of the inner circumferential surface of the tire, which is irregularly shaped and covers the periphery of the inner electric heating pad 32 arranged on the surface of the inner heat transfer intermediate member 72 of the inner patch member 22 as the repair material.

The cross-sectional shape of the packing member such as a wood chip may be a shape other than a substantially circular shape, for example, a polygonal shape such as an ellipse, a semicircle, a triangle, or a quadrangle, or a shape obtained by combining a polygonal shape and a circular arc.

As shown in fig. 31, a wood chip 40 is filled into the tire inner side of a tire circumferential direction portion 1a of a tire 1 for a construction vehicle so as to protrude from an opening between bead portions 8, 8 facing each other, a plate-like pressing member 41 is placed on the protruding wood chip 40, a cover plate 42 widely covers an outer electric heating pad 31 disposed on a surface of an outer heat conduction intermediating member 71 and a periphery thereof, and the outer heat conduction intermediating member 71 covers a side repair rubber portion 25 filled in an outer repair recess 11 of a damaged portion 10.

Next, the tire circumferential direction portion 1a of the tire 1 for a construction vehicle, in which the wood pieces 40 are filled, and the portion in the vicinity thereof are wound and fastened by, for example, four tapes 45 from the outside of the pressing member 41 and the cap plate 42.

Four belts 45 are wound, and the belts 45 are fastened and connected at both ends by buckles 46 (see fig. 8).

By fastening the four belts 45, the wood pieces 40 filled between the bead portions 8 and 8 of the wood pieces 40 on the inner side of the tire 1 for a construction vehicle are pressed by the pressing member 41, and pressure is sequentially transmitted to the wood pieces 40 on the inner side of the tire, and the pressure expanded from the inner side is applied to the inner liner portion 4 on the inner peripheral surface of the tire.

The pressure generated by fastening the four belts 45 is applied to the tread portion 6 and the sidewall portion 7 on the outer circumferential surface of the tire from the outside of the tire 1 for a construction vehicle.

Therefore, the side repairing rubber portion 25 filled in the outer repairing recess 11 of the damaged portion 10 is pressurized through the outer electric heating pad 31 and the outer heat transfer intermediary member 71, and the inner patch member 22 attached to the inner repairing recess 12 of the damaged portion 10 is pressurized through the inner electric heating pad 32 and the inner heat transfer intermediary member 72 by the wood chips 40.

In the present embodiment, the repair portion is fastened by the four-band-bundle-shaped bands 45, but the number of bands and the width of the bands can be appropriately changed depending on the size and position of the repair portion, and in some cases, the repair portion can be fastened by a wide band that sufficiently covers the repair portion.

Then, by flowing a current to the outer electric heating pad 31 and the inner electric heating pad 32 to generate heat, the side repair rubber portion 25 and the inner patch member 22, which are the repair material made of unvulcanized rubber, are heated and vulcanized via the outer heat transfer intermediate member 71 and the inner heat transfer intermediate member 72, and are joined to the vulcanized rubber around the repair material.

In this heat vulcanization step, the central heat conduction intermediate member 71c of the outer heat conduction intermediate member 71 disposed in the side repair rubber portion 25 and the central heat conduction intermediate member 72c of the inner heat conduction intermediate member 72 disposed in the inner patch member 22 have a large heat conductivity, efficiently transfer heat, and promote vulcanization of the unvulcanized rubber of the repair material, so that the vulcanization time can be shortened.

On the other hand, the heat conductivity coefficient of the peripheral heat conduction intermediating member 71s of the outer heat conduction intermediating member 71 disposed on the tire surface (the surface of the side wall portion 7) around the side repair rubber portion 25 and the heat conductivity coefficient of the peripheral heat conduction intermediating member 72s of the inner heat conduction intermediating member 72 disposed on the tire inner surface (the surface of the inner liner portion 4) around the inner patch member 22 are small, so that heat transfer can be suppressed, and over-vulcanization of the vulcanized rubber around the repair material (the side repair rubber portion 25, the inner patch member 22) can be suppressed.

In the fifth embodiment, the central heat transfer mediating member 71c of the outer heat transfer mediating member 71 and the central heat transfer mediating member 72c of the inner heat transfer mediating member 72 are bag bodies each formed by packing a metal sheet m in a cloth bag or the like, but the material packed in the bag body is not limited to the metal sheet m, and may be other small pieces having a relatively large heat transfer coefficient as long as the bag body can be freely deformed.

On the other hand, the peripheral heat transfer mediating member 71s of the outer heat transfer mediating member 71 and the peripheral heat transfer mediating member 72s of the inner heat transfer mediating member 72 are bag bodies formed by packing the wood chips w in a cloth bag or the like, but the material packed in the bag bodies is not limited to the wood chips w, and may be other small pieces having a relatively small heat transfer coefficient as long as the bag bodies can be freely deformed.

The member to be packed in the bag is not limited to one type, and two or more types of the members may be mixed, for example, the peripheral heat transfer intermediates 71s and 72s are bags packed with the wood chips w, and the central heat transfer intermediates 71c and 72c may be used as bags packed with the wood chips w mixed with the metal chips m.

Further, the heat conduction medium member may be a plate member that can be easily deformed, instead of a bag body formed by filling a small piece in a cloth bag or the like, and for example, the central heat conduction medium member may be a metal plate such as an aluminum plate, and the peripheral heat conduction medium member may be a wood plate such as a plywood.

Next, a method for repairing a tire according to a modification of the fifth embodiment will be described below with reference to fig. 32.

This modification of the fifth embodiment is the same as the fifth embodiment except that an outer heat transfer intermediate member 81 and an inner heat transfer intermediate member 82 different from the outer heat transfer intermediate member 71 and the inner heat transfer intermediate member 72 of the fifth embodiment are used.

Therefore, in fig. 32, the components other than the outer heat transfer intermediate member 81 and the inner heat transfer intermediate member 82 are the same components and denoted by the same reference numerals.

In the present modification of the fifth embodiment, the central heat-transfer mediating member 81c of the outer heat-transfer mediating member 81 disposed on the surface of the side repair rubber portion 25 is a bag body formed by packing a metal piece m (indicated by a black dot ● in fig. 32) in a cloth bag or the like, and the peripheral heat-transfer mediating member 81s disposed on the tire surface (the surface of the side wall portion 7) in the periphery of the side repair rubber portion 25 is a bag body formed by packing wood chips w (indicated by a blank circle in fig. 32) in a cloth bag or the like.

Similarly, the central heat-transfer intermediate member 82c of the inner heat-transfer intermediate member 82 disposed in the inner patch member 22 is a bag body formed by packing a metal sheet m (indicated by a black dot ● in fig. 32) in a cloth bag or the like, and the peripheral heat-transfer intermediate member 82s disposed in the tire inner surface (the surface of the inner liner portion 4) in the periphery of the inner patch member 22 is a bag body formed by packing wood chips w (indicated by a blank circle in fig. 32) in a cloth bag or the like, but as shown in fig. 32, the peripheral heat-transfer intermediate member 82s having a small thermal conductivity is thicker than the central heat-transfer intermediate member 82c, and further suppresses heat transfer.

Therefore, the central heat conduction intermediate member 81c of the outer heat conduction intermediate member 81 disposed in the side repair rubber portion 25 and the central heat conduction intermediate member 82c of the inner heat conduction intermediate member 82 disposed in the inner patch member 22 have a large heat conductivity and are thinner, so that heat is transmitted more efficiently, and vulcanization of the unvulcanized rubber of the repair material (the side repair rubber portion 25 and the inner patch member 22) is promoted, thereby shortening the vulcanization time.

On the other hand, the peripheral heat conduction intermediating member 81s of the outer heat conduction intermediating member 81 disposed on the tire surface (the surface of the side wall portion 7) around the side repair rubber portion 25 and the peripheral heat conduction intermediating member 82s of the inner heat conduction intermediating member 82 disposed on the tire inner surface (the surface of the inner liner portion 4) around the inner patch member 22 have a smaller thermal conductivity and a larger thickness, so that heat transfer is further suppressed, vulcanization is further suppressed, and overcuring of vulcanized rubber around the repair material is reliably prevented.

Further, since the peripheral heat transfer intermediation members 81s and 82s of the outer heat transfer intermediation member 81 and the inner heat transfer intermediation member 82 are configured to gradually increase in thickness as they become farther from the repair material, the heat transfer becomes better as they become closer to the repair material, and the repair material and the vulcanized rubber around them can be firmly joined to each other.

Further, the heat transfer medium member may be a plate member that can be easily deformed, instead of a bag body in which small pieces are packed in a cloth bag or the like, and for example, the central heat transfer medium member may be a metal plate such as an aluminum plate having a small thickness, and the peripheral heat transfer medium member may be a wood plate such as a plywood plate having a gradually increased thickness as the thickness is farther from the repair material.

Next, a tire repair method according to a sixth embodiment will be described below with reference to fig. 33.

The sixth embodiment is different from the fifth embodiment in that it is the same as the fifth embodiment except that it includes the outer heat transfer intermediate member 91 and the inner heat transfer intermediate member 92 corresponding to the peripheral heat transfer intermediate member 81s of the outer heat transfer intermediate member 81 and the peripheral heat transfer intermediate member 82s of the inner heat transfer intermediate member 82 in the fifth embodiment, but does not include the heat transfer intermediate members corresponding to the central heat transfer intermediate members 81c and 82 c.

Therefore, in fig. 33, the parts other than the outer heat transfer intermediate member 91 and the inner heat transfer intermediate member 92 are the same parts and denoted by the same reference numerals.

That is, the outer heat transfer intermediary member 91 in the sixth embodiment is disposed on the tire surface (the surface of the side wall portion 7) around the side repair rubber portion 25, and the inner heat transfer intermediary member 92 is disposed on the tire inner surface (the surface of the inner liner portion 4) around the inner patch member 22.

The outer heat transfer intermediate member 91 and the inner heat transfer intermediate member 92 are both bag bodies formed by packing wood chips w (indicated by blank circles in fig. 33) in a cloth bag or the like, and are configured to have a gradually increasing thickness as the distance from the repair material increases.

The outer heat conduction intermediate member 91 and the inner heat conduction intermediate member 92 may be plate members having a small heat conductivity, and may be, for example, wood plates having a thickness gradually increasing as the distance from the repair material increases.

Therefore, the central portion of the outer electric heating pad 31 disposed on the surface of the outer heat transfer intermediate member 91 is directly in contact with the side repair rubber portion 25, and the central portion of the inner electric heating pad 32 disposed on the surface of the inner heat transfer intermediate member 92 is directly in contact with the inner patch member 22.

Since no heat conduction intermediate member is disposed in the side repair rubber portion 25 and the inner patch member 22, heat is directly transferred to promote vulcanization of the unvulcanized rubber of the repair material (the side repair rubber portion 25 and the inner patch member 22), and therefore, the vulcanization time can be shortened.

On the other hand, the outer heat conduction intermediary member 91 having a small heat conductivity coefficient is interposed between the outer electric heating pad 31 and the tire portion around the side repair rubber portion 25 to suppress heat transfer, and the inner heat conduction intermediary member 92 having a small heat conductivity coefficient is interposed between the inner electric heating pad 32 and the tire portion (inner liner portion 4) around the inner patch member 22 to suppress heat transfer, so that the vulcanized rubber around the repair material (the side repair rubber portion 25, the inner patch member 22) can be suppressed from being excessively vulcanized.

Further, since the outer heat transfer intermediate member 91 and the inner heat transfer intermediate member 92 are configured to have a gradually increased thickness as they are farther from the repair material, the heat transfer becomes better as they approach the repair material, and therefore they are heated as they approach the repair material, and the repair material and the vulcanized rubber around them can be firmly joined to each other.

The fifth and sixth embodiments described above are repairing methods for a case where the sidewall portion 7 of the tire 1 for a construction vehicle is damaged, and a repairing method of a seventh embodiment for a case where the tread portion is damaged will be described below with reference to fig. 34.

In the seventh embodiment, the same components as those used in the fifth and sixth embodiments are denoted by the same reference numerals.

The seventh embodiment is a repairing method for repairing a case where the tread portion 6 of the tire 1 for a construction vehicle is cut and the belt layer 5 and the carcass ply 3 inside the tread portion 6 are damaged by being cut.

First, the rubber around the damaged portion 10 (see fig. 13) of the tread portion 6 is removed by scraping from the tire outer side until the carcass ply 3 is exposed, and the rubber around the damaged portion 10 of the liner portion 4 (see fig. 1) is removed from the tire inner side until the carcass ply 3 is exposed.

Next, the inner patch member 22 is stuck to the exposed portion of the carcass ply 3 from the inside, and the inner patch member 22 covers the defective portion of the carcass ply 3 and the periphery thereof.

The inner patch member 22 is a member in which a patch-like inner liner repair rubber member 24 is bonded to a reinforcing sheet 23 as a cord rubber-coated sheet in which a plurality of reinforcing cords are rubber-coated, and is integrated in advance.

Since the tire is damaged to the belt 5, the cord rubber-covered sheet of the reinforcing sheet 23 is a laminate of rubber sheet layers covering reinforcing cords arranged in parallel in one direction, and the embedded reinforcing cords intersect at right angles to each other in the superposed rubber sheet layers to reinforce the damaged belt 5. The reinforcing cords may also intersect each other at right angles. Further, the lining repair rubber member 24 may be bonded to the reinforcing sheet 23.

Next, the original tread pattern is formed by the repair rubber portion 25 which repairs the damaged portion of the tread portion 6 to the shape before the damage, so as to compensate the unvulcanized soft rubber, in the outer repair concave portion which is scraped from the outer side of the tire until the carcass ply 3 is exposed.

As the mold 61 for retaining the shape of the repair rubber portion 25 repaired with the unvulcanized soft rubber, gypsum slurry (gypsum slurry) obtained by mixing water with powdered plaster as a main component is used, and the mold 61 is made to flow so as to fill the groove portions of the tread pattern of the repair rubber portion 25 and the periphery thereof, and the surface of the mold 61 and the surface of the land portion are made to be substantially flush with each other.

The mold material 61 having fluidity thus flowed into the groove portion is left to solidify and dried, and the excess water contained in the mold material 61 is removed.

As shown in fig. 34, after the profile 61 is cured and dried, the outer heat conduction intermediating member 101 is disposed on the repair rubber portion 25 of the damaged portion of the tread portion 6 of the tire for a construction vehicle 1 and the tread around the same, and the inner heat conduction intermediating member 102 is disposed on the surface of the inner patch member 22 and the tire inner surface (the surface of the inner liner portion 4) around the inner patch member 22.

The outer heat conduction intermediate member 101 is composed of a central heat conduction intermediate member 101c disposed in the repair rubber portion 25 and a peripheral heat conduction intermediate member 101s disposed on the tire surface (the surface of the tread portion 6) in the periphery of the repair rubber portion 25, and the heat conductivity coefficients of the two members are different from each other.

The central heat-transfer intermediate member 101c of the outer heat-transfer intermediate member 101 is a bag body formed by packing a metal piece m (indicated by a black dot ● in fig. 34) such as iron into a cloth bag or the like, and the peripheral heat-transfer intermediate member 101s of the outer heat-transfer intermediate member 101 is a bag body formed by packing a wood chip w (indicated by a blank circle in fig. 34) into a cloth bag or the like.

Therefore, the peripheral heat transfer medium member 101s as the bag body containing the wood chips w has a smaller heat conductivity than the central heat transfer medium member 101c as the bag body containing the metal sheet m.

Similarly, the inner heat conduction intermediate member 102 is composed of a central heat conduction intermediate member 102c disposed on the surface of the inner patch member 22 and a peripheral heat conduction intermediate member 102s disposed on the tire inner surface (the surface of the inner liner 4) in the periphery of the inner patch member 22, and has different thermal conductivities.

The central heat-transfer intermediate member 102c of the inner heat-transfer intermediate member 102 is a bag body formed by packing a metal piece m (indicated by a black dot ● in fig. 34) such as iron into a cloth bag or the like, and the peripheral heat-transfer intermediate member 102s of the inner heat-transfer intermediate member 102 is a bag body formed by packing a wood chip w (indicated by a blank circle in fig. 34) into a cloth bag or the like.

Therefore, the peripheral heat transfer medium member 102s as the bag body containing the wood chips w has a smaller heat conductivity than the central heat transfer medium member 102c as the bag body containing the metal sheet m.

Next, the outer electric heating pad 31 is disposed on the surface of the repair rubber portion 25 disposed in the damaged portion of the tread portion 6 and the outer heat transfer intermediate member 101 of the tread in the periphery thereof, and the inner electric heating pad 32 is disposed on the surface of the inner heat transfer intermediate member 102 disposed in the inner surface of the tire in the damaged portion.

Next, as in the fifth and sixth embodiments, the wood chips 40 are filled as a filler member into the tire 1 at the tire inner side of the tire circumferential direction portion 1b and the peripheral portion thereof defined along the tire circumferential direction where the repair material (the inner patch member 22 and the repair rubber portion 25) is arranged.

Among the filled wood chips 40, the gasket peripheral wood chips 40s filled in the periphery of the inner electric heating gasket 32 have a smaller sectional area than the other wood chips 40.

Therefore, a plurality of pad peripheral wood pieces 40s having a small cross-sectional area can be finely arranged on the surface of the inner circumferential surface of the tire, which covers the irregular shape of the periphery of the inner electric heating pad 32 arranged on the inner heat conduction intermediate member 102 of the inner patch member 22 as a repair material, to uniformly apply pressure to the inner electric heating pad 32.

As in the fifth and sixth embodiments, the wood chips 40 are filled into the tire inner side of the tire circumferential direction portion 1b of the tire 1 for a construction vehicle so as to protrude from the opening between the bead portions 8 and 8 facing each other, although not shown, and the plate-like pressing member 41 is placed on the protruding wood chips 40, and the cover plate 42 widely covers the outer electric heating pad 31 disposed on the side repairing rubber portion 25 and the periphery thereof, and the side repairing rubber portion 25 is filled in the outer repairing recess 11 of the damaged portion 10, as in the case of fig. 31.

Next, the tire circumferential direction portion 1b of the tire 1 for a construction vehicle, in which the wood pieces 40 are filled, and the portion around the portion are wound and fastened by the tape 45 from the outside of the pressing member 41 and the cap plate 42.

Then, the repair rubber portion 25 and the inner patch member 22, which are repair materials made of unvulcanized rubber, are heated and vulcanized through the heat conductive intermediate members 101 and 102 by flowing current to the outer electric heating pad 31 and the inner electric heating pad 32 to generate heat, and at the same time, the repair materials and vulcanized rubber around the repair materials are joined to each other.

In this heat vulcanization step, the central heat conduction intermediate member 101c of the outer heat conduction intermediate member 101 and the central heat conduction intermediate member 102c of the inner heat conduction intermediate member 102, which are disposed in the repair rubber portion 25 at the damaged portion of the tread portion 6, have a large thermal conductivity, efficiently transfer heat, and promote vulcanization of the unvulcanized rubber of the repair material, so that the vulcanization time can be shortened.

On the other hand, the heat conductivity coefficient of the peripheral heat conduction intermediating member 101s of the outer heat conduction intermediating member 101 disposed on the tire surface (the surface of the side wall portion 7) around the repair rubber portion 25 and the heat conductivity coefficient of the peripheral heat conduction intermediating member 102s of the inner heat conduction intermediating member 102 disposed on the tire inner surface (the surface of the inner liner portion 4) around the inner patch member 22 are small, so that heat transfer is suppressed, and over-vulcanization of the vulcanized rubber around the repair material can be suppressed.

After completion of vulcanization, the belt 45, the cap plate 42 and the outer electric heating pad 31 are removed, the pressing member 41 is removed, the inner wood piece 40 of the tire is removed, the inner electric heating pad 32 is removed, and the cured material 61 filling the groove portion of the tread pattern is removed, whereby the repair work of the damaged portion of the tire 1 for construction vehicles is completed.

In the seventh embodiment, the peripheral heat transfer intermediate members 101s and 102s having a small heat conductivity may be thicker than the central heat transfer intermediate members 101c and 102 c.

The central heat-transfer intermediate members 101c and 102c having a large heat conductivity are thin, and therefore, heat is transferred more efficiently, and vulcanization of the unvulcanized rubber of the repair material (the repair rubber portion 25 and the inner patch member 22) is further promoted, so that the vulcanization time can be further shortened.

Further, since the peripheral heat transfer intermediating members 101s, 102s having a small thermal conductivity are thick, the heat transfer is further suppressed, and the vulcanized rubber around the repair material is reliably prevented from being excessively vulcanized.

In the seventh embodiment, the heat transfer intermediate member may be a plate member that can be easily deformed, instead of a bag body formed by filling a small piece of cloth or the like, and for example, the central heat transfer intermediate member may be a metal plate such as an aluminum plate, and the peripheral heat transfer intermediate member may be a wood plate such as a plywood.

In the above embodiment, the tire having the damaged portion reaching the carcass ply was repaired, but in the method for repairing a tire according to the present invention, even in the case of a damaged tire in which the damaged portion does not reach the carcass ply or the belt layer, the repair rubber is filled in the repair recess, whereby the tire can be repaired in the same manner.

While the tire repair methods according to the various embodiments of the present invention have been described above, the embodiments of the present invention are not limited to the above-described embodiments, and various repair methods can be performed within the scope of the present invention.

For example, the tire repairing method of the present invention is not limited to a large-sized tire for a construction vehicle, and can be applied to a small-sized tire if it is a pneumatic tire.

Description of the symbols

1-tire for construction vehicle, 1a, 1 b-tire circumferential portion, 2-bead ring, 3-carcass ply, 4-inner liner portion, 5-belt, 6-tread portion, 7-sidewall portion, 8-bead portion, 10-damaged portion, 11-outer repaired recess, 12-inner repaired recess, 21-outer patch member, 22-inner patch member, 23-reinforcing sheet, 23 a-reinforcing cord, 24-inner liner repaired rubber member, 25-side repaired rubber portion, 31-outer electric heating liner, 32-inner electric heating liner, 40-wood sheet, 40 s-liner peripheral wood sheet, 41-pressing member, 42-cover plate, 45-belt, 46-buckle, 51-iron rod, 57-tread rubber, 58-repaired portion, 60-repaired rubber portion, 61-profile, 64-repaired portion, 63-shoulder portion, 67-damaged portion, 68-inner liner portion, 71, 81, 67-inner liner portion, 91. 101-outer heat-conducting intermediate member, 71c, 81c, 101 c-central heat-conducting intermediate member, 71s, 81s, 101 s-peripheral heat-conducting intermediate member, 72, 82, 92, 102-inner heat-conducting intermediate member, 72c, 82c, 102 c-central heat-conducting intermediate member, 72s, 82s, 102 s-peripheral heat-conducting intermediate member.

Claims (11)

1. A method of repairing a tire, characterized in that,

at least a repair material made of unvulcanized rubber is disposed at a damaged portion of a damaged tire,

a heating pad is arranged on the surface of the repairing material arranged on the damaged part of the tire,

filling a plurality of filler members into a tire inner side of a tire circumferential direction portion defined along the tire circumferential direction and provided with the repairing material, the filler members filling the tire inner side with a longitudinal direction thereof directed in a direction perpendicular to a tire widthwise cross section, and pressurizing the damaged portion over a full width in the direction perpendicular to the tire widthwise cross section,

the tire circumferential direction portion is tightened and pressurized from the periphery,

heating the repair part including the damaged part by the heating pad to vulcanize the unvulcanized rubber of the repair material,

the above-mentioned tampon member comprises: a central stuffing component corresponding to the repairing material and pressurizing the repairing material; and an outer periphery packing member corresponding to the tire portion of the outer edge portion of the repair material and pressurizing the tire portion of the outer edge portion of the repair material,

the peripheral padding member has a thermal conductivity greater than the central padding member.

2. The method of repairing a tire according to claim 1,

the repairing material is arranged at a position on the inner side of the tire reaching the damaged position from the inner side of the tire, the heating pad is arranged on the inner side of the repairing material,

the pad-periphery packing member filled in the vicinity of the heating pad has a smaller cross-sectional area in the tire width direction than the other packing members.

3. The method of repairing a tire according to claim 1,

the packing member is formed in a rod shape,

the packing member is inserted into the tire in a posture in which a direction perpendicular to a cross section in the tire width direction is set as a longitudinal direction.

4. The method of repairing a tire according to claim 1,

the tire is tightened by a winding belt at the tire circumferential direction portion filled with the filler member, thereby performing pressurization.

5. The method of repairing a tire according to claim 1,

the damaged portion of the tire is a tread portion,

mixing at least water and a water-insoluble member in plaster of paris to prepare a shape in a fluid state,

filling the groove portion of the tread portion, which is repaired by the repairing material around the damaged portion of the tread shape including the groove portion, with the fluid profile,

after the profile is cured and dried, the heating pad is disposed on the surface of the tread portion of the damaged portion, and the damaged portion is pressurized,

the damaged portion is heated by the heating pad to vulcanize the unvulcanized rubber.

6. The method of repairing a tire according to claim 5,

the damaged portion is a tire width direction end portion of the tread portion,

filling the groove portion around the damaged portion with the profile, and covering a side surface of the repaired portion, which is a tire width direction side surface, with the profile,

after the mold material is cured and dried, the unvulcanized rubber is vulcanized by pressurizing and heating the repaired portion.

7. The method of repairing a tire according to claim 5 or 6,

the water-insoluble member is made of at least one of rubber, wood, and metal.

8. The method of repairing a tire according to claim 5 or 6,

after a heating liner is disposed on the surface of the tread portion of the repaired portion,

the filler member is filled into the inner side of the tire at a tire circumferential direction portion defined along the tire circumferential direction where the repair portion exists,

the tire circumferential direction portion is tightened and pressurized from the periphery,

the heating pad is used to heat the repaired part to vulcanize the unvulcanized rubber.

9. The method of repairing a tire according to claim 1 or 5,

a central heat conduction medium member is arranged on the surface of the repairing material arranged on the damaged part of the tire,

a peripheral heat transfer intermediate member having a smaller thermal conductivity than the central heat transfer intermediate member is disposed on the tire surface in the peripheral edge portion of the repair material,

the heating pad is disposed on the surfaces of the central heat-conducting intermediary member and the peripheral heat-conducting intermediary member, and the damaged portion and the periphery thereof repaired with the repairing material are pressurized,

the damaged portion is heated by the heating pad, and the unvulcanized rubber of the repair material is vulcanized.

10. The method of repairing a tire according to claim 9,

the thickness of the peripheral heat conduction intermediate member is thicker than the thickness of the central heat conduction intermediate member.

11. The method of repairing a tire according to claim 1 or 5,

a repair material made of unvulcanized rubber is arranged at least at a damaged portion of the tire,

a heat transfer medium member is disposed on the tire surface of the peripheral edge portion of the repair material disposed at the damaged portion of the tire,

heating pads are disposed on the surface of the repairing material and the surface of the heat-conducting medium member,

the periphery of the repaired part repaired by the repairing material is pressurized,

the heating pad heats the repaired portion to vulcanize the unvulcanized rubber of the repairing material.

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